Typescript 5.7 breaks "module"="NodeNext"

[FranzZemen]

🔎 Search Terms

Typescript 5.7 breaks features provided by "module"="NodeNext", specfically the ability to import via either the package name or through an package.json imports definition.

With 5.7.* when using the package name by way of an package.json exports or a project name by way of the package.json imports feature, we get errors like:

File '/home/franzzemen/dev/typescript5.7.2-defect/src/project/dummy/dummy.ts' is not under 'rootDir' '/home/franzzemen/dev/typescript5.7.2-defect/src/test'. 'rootDir' is expected to contain all source files.
  File is ECMAScript module because '/home/franzzemen/dev/typescript5.7.2-defect/package.json' has field "type" with value "module"

These errors are not observed in prior versions.

A sample repository to repeat this issue is provided in https://github.com/FranzZemen/typescript5.7.2-defect

It currently builds using: "typescript": "^5.6.3". The build fails when upgrading typescript.

The project contains a dummy.ts source file in a project folder, and a dummy.test.ts which refers to the dummy.ts via an import from the #project symbol defined in the package.json.

🕗 Version & Regression Information

• This changed between versions 5.6.3 and 5.7.2

⏯ Playground Link

No response

💻 Code

A sample repository to repeat this issue is provided in https://Github.com/FranzZemen/typescript5.7.2-defect

It currently builds using: "typescript": "^5.6.3". The build fails when upgrading typescript.

Files:

tsconfig.json

'''json
{
"files": [],
"include": [],
"references": [
{
"path": "./src/project/tsconfig.json"
},
{
"path": "./src/test/tsconfig.json"
}
]
}
'''

tsconfig.base.json

'''json
{
"compilerOptions": {
"allowUnreachableCode": false,
"allowUnusedLabels": false,
"alwaysStrict": false,
"exactOptionalPropertyTypes": true,
"noFallthroughCasesInSwitch": true,
"noImplicitAny": true,
"noImplicitOverride": true,
"noImplicitReturns": true,
"noImplicitThis": true,
"noPropertyAccessFromIndexSignature": true,
"noUncheckedIndexedAccess": true,
"noUnusedParameters": false,
"strict": true,
"strictBindCallApply": true,
"strictFunctionTypes": true,
"strictNullChecks": true,
"strictPropertyInitialization": true,
"useUnknownInCatchVariables": true,
"allowJs": true,
"checkJs": true,
"maxNodeModuleJsDepth": 0,
"allowSyntheticDefaultImports": true,
"esModuleInterop": true,
"forceConsistentCasingInFileNames": true,
"isolatedModules": false,
"preserveSymlinks": true,
"emitDeclarationOnly": false,
"downlevelIteration": true,
"emitBOM": false,
"importHelpers": true,
"importsNotUsedAsValues": "remove",
"noEmit": false,
"noEmitHelpers": false,
"noEmitOnError": false,
"preserveConstEnums": false,
"preserveValueImports": false,
"newLine": "crlf",
"composite": true,
"incremental": true,
"declaration": true,
"sourceMap": true,
"noErrorTruncation": true,
"pretty": true
}
}
'''

package.json

'''json
{
"name": "typescript5.7.2-defect",
"version": "1.0.0",
"description": "",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"@types/chai": "^5.0.1",
"@types/mocha": "^10.0.10",
"chai": "^5.1.2",
"mocha": "^10.8.2"
},
"type": "module",
"exports": {
".": {
"import": "./src/project/index.ts"
}
},
"imports": {
"#project": "./src/project/project-index.ts"
},
"dependencies": {
"typescript": "^5.6.3"
}
}

'''

/test/dummy.test.ts

'''ts
/*
Created by Franz Zemen 11/23/2024
License Type:
*/

import 'mocha';
import {expect} from 'chai';
import {helloWorld} from '#project';

describe('dummy test', () => {
it('should pass', () => {
expect(helloWorld()).to.equal(' World!');
});
});
'''

/test/tsconfig.json

'''json
{
"extends": "../../tsconfig.base.json",
"compilerOptions": {
"module": "NodeNext",
"target": "ESNext",
"moduleResolution": "NodeNext",
"tsBuildInfoFile": "../../out/buildInfo/testTsInfo",
"declarationDir": "../../out/test/types",
"outDir": "../../out/test"
},
"include": [
"**/*"
]
}
'''

/project/index.ts

'''ts
/*
Created by Franz Zemen 11/23/2024
License Type:
*/

export * from './dummy/dummy.js';
'''

/project/project-index.ts

'''ts
/*
Created by Franz Zemen 11/23/2024
License Type:
*/

export * from './dummy/dummy.js';
'''
/project/tsconfig.json

'''json
{
"extends": "../../tsconfig.base.json",
"compilerOptions": {
"module": "NodeNext",
"target": "ESNext",
"moduleResolution": "NodeNext",
"tsBuildInfoFile": "../../out/buildInfo/projectTsInfo",
"declarationDir": "../../out/project/types",
"outDir": "../../out/project"
},
"include": [
"**/*"
]
}
'''

/project/dummy/dummy.ts

'''ts
/*
Created by Franz Zemen 11/23/2024
License Type:
*/

export function helloWorld() {
return 'Hello World!';
}
'''

🙁 Actual behavior

Transpile error, wrong because all settings for NodeNext are properly set and works with prior versions of typescript

🙂 Expected behavior

Transpilation without errors

Additional information about the issue

No response